What are Hidden Surveillance Cameras?

Surveillance cameras are quasi-cameras used in security. Its pixels and resolution are higher than the video head of the computer and lower than professional digital cameras or dv. Surveillance cameras are mostly just a single video capture device and rarely have data storage capabilities.

Security camera

Surveillance cameras are used in

Surveillance Camera (NEW: Remote Camera)

In the security system, the current generation of images is mainly from

Network cameras are a new generation of products combining traditional cameras and network video technology. In addition to all the image capture functions of conventional cameras, a digital compression controller and a WEB-based operating system are built into the camera. After the video data is compressed, Send to end users via LAN, internet or wireless network. along with

The function of the surveillance camera is to take pictures of the surveillance area and convert them into electrical signals. According to the specifications, it can be divided into 1/3 , 1/2 and 2/3 types. There are two types of installation methods: fixed and PTZ .

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Step 1: Take out

One. No image:
1. Check whether the power supply is well connected and whether the power supply voltage meets the requirements (power supply error: DC12V + 10% AC24V + 5%);
2. Whether the BNC head or video cable is in good contact;
3 Whether the lens auto iris is open;
4 Whether the video or DC-driven automatic aperture lens control line is shorted to ground;
5. Check if the video leakage causes the CCD board video to burn all the way;
two. Image quality is not good:
1. Whether the lens has fingerprints or is too dirty;
2. Whether the aperture is adjusted properly;
3 Video cable has poor contact;
4 Whether there is a problem with the electronic shutter or white balance setting;
5. Whether the transmission distance is too far;
6. Whether the voltage is normal;
7. Whether there are interference sources nearby;
8. When installing in an elevator, ensure insulation with the elevator to avoid interference;
9. Whether the focal length of the lens is not adjusted properly;
10. Whether the CCD of the board is uneven;
11. Check whether the lens is a C-type interface or a CS-type interface. If the C-type interface must be added with a ring, if the CS-type interface, remove the ring
III. Infrared camera has poor night vision, aperture, and normal daytime images: `
1. Check if the infrared light is not bright enough;
2. 2. Check if the distance between the lens case and the lens is too large. Whether the infrared light matches the lens (please see the reference table for details)
4 Check if the infrared light is activated;
5. Check whether the CCD camera or lens is infrared sensitive;
6. Check whether there are reflective objects in the surrounding environment or whether the space used is small;
7. Check whether the effective infrared distance of the machine corresponds to the actual distance. IV. Sometimes when there is no image:
1. Whether the power supply voltage is stable;
2. Whether the video cable is loose and the connector is firm;
3 Whether the video is in good contact;
4 Is there any disconnection or poor contact of the power cord? There are several black bars or horizontal bars mixed on the screen:
This situation is usually caused by the ripple of the output voltage of the power supply of the machine is too large or the power supply voltage of the machine is too low;
6. The image appears distorted or geometrically distorted:
1. Check whether the optical lens used is abnormal;
2. Is the output impedance switch of the monitor set to 75 ohms?
3. Check if the impedance of the video connection cable used is 75 ohms;
Seven. The integrated infrared camera works normally during the day and no image at night:
It is because the power of the power supply cannot meet the requirements, because the infrared all-in-one is no different from ordinary cameras when working in the daytime, but at night the infrared light is in the working state and the working current suddenly increases;
Eight. Integrated camera cannot focus automatically:
1. Check whether the focusing state of the integrated camera is in the key control priority or the auto focus state;
2. The ambient light is too bright, causing the camera brightness to be too high. The camera cannot find the focus point.
Nine. The image appears black and white without color:
1. The video line is too long and the video signal attenuation is too large;
2. Monitor is turned to black and white;
3 The crystal oscillation frequency of the CCD board machine is out of range;
4 The color value of the CCD board program software is adjusted too small, which causes its color to be hardly displayed.
ten. All-in-one camera suddenly restarts when zooming in or the image does not appear after a period of time:
Because integrated cameras have relatively high power requirements, the operating current suddenly increases due to the need to drive the motor when zooming. This will cause insufficient supply of decoders (boards) that are insufficiently powered and cause the camera to suddenly power off.
eleven. Like whitish and foggy:
1. Check whether there is water mist inside the machine;
2. Check if the lens cover is tight against the glass;
3 Check if the camera has a lens case;
4 Check whether there is water mist in the CCD of the board machine;
5. Check if the camera's electronic shutter is open (if it is open, close it);
6. Check whether the infrared light board is parallel to the lens (that is, there is a certain angle between the infrared light and the lens);
7. Figure to check whether the lens is higher than the lens case, just as high (generally, the lens case is 3-4 mm higher than the lens);